Given the error message "HW already trialled", we may assume ExaGear is calling some internal hardcoded serial ID from the RasPi to assign one trial per board.

If the user types in the following in the terminal: cat/ proc/cpuinfo |grep Serial

we obtain the 16 hex digits serial number that is assigned randomly by the hardware RNG during production testing.Albeit it is very improbable, there is always the possibility of a collision where two RasPi will have the same ID.

Now, reduce the pool of RasPi users toying with ExaGear Desktop, that makes it even more improbable. However,if that ever occurred two RasPi units had the same ID, another user might have used up the trial unbeknownst of thesecond owner.

Again, these are speculations...and not really a solution. Only ExaGear employees would know what to do.